Stove



Sept. 17, 1935.

B. B. KAHN 2,014,848

STOVE Filed May 1, i931 5 sheets-sheet l .l Enum' B. B. KAHN Sept. 17, 1935.

sTovE Filed May 1, 1951 '5 Sheets-Sheet 2 WWMI VIII B. B. KAHN Sept. 17, 1935.

STOVE Filed May 1. 1931 I5 Sheets-Sheet 5 a www WM Patented sept. 1.7, 193s UNITED STATES STOVE Bertrand B. Kahn, Cincinnati, Ohio, assignor to The Estate Stove Company, Hamilton, Ohio, a

corporation of Ohio Application May 1, 1931, Serial No.'534,199 a Claims. (Cl. 15V-117.1)

This invention relatesto stoves.

Oneoi theprincipal objects of the invention is the provision in a stove of visual, or the like, means for indicating whether or not a burner, such as a normally burning pilot light, is functioning properly. f

Another object of the invention is the provision of such means whichA comprises heat responsive mechanism associated with the pilot for automatically indicating whether or not the pilot is burning.

Another object ofthe invention is the provision in a stove of an automatically actuated valve responsive to abnormal variations in operation for preventing the uncontrolled escape of gas.

A further object of the invention is the provision in a stove having a normally burning pilot light arranged to automatically ignite gas escaping from a burner, of a control valve operatively associated with the gas supply of the burner and arranged to automatically close upon failure of the pilot. Y

Other objects and advantages of the invention will be apparent from the following description, the accompanying drawings, and the appended claims.

In the drawings, which illustrate preferred embodiments of the invention- Fig. 1 is a plan view, partly in section, of a stove constructed in accordance with this invention;

Fig. 2 is a sectional view taken on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary elevational view ci the stove;

Fig. 4 is a fragmentary view taken similarly to vIliig. 1 and showing a somewhat different arrangement of parts;

Fig. 5 is a sectional view taken on the line 5-5 of Fig. 4;

Fig. 6 is a detailed view of the control mechanism;

Fig. 'I is a sectional View taken on the line 'I`-'l of Fig. 1;

Fig. 8 is a sectional view of a control valve;

Fig. 9 is a side elevational view of the indicating target;

" Fig. 10 is a detailed view of the indicating target; and

Fig. 11 is a fragmentary view showing a different heat responsive member.

The drawings, in which like characters of reference designate like parts throughout the several views thereof, illustrate the invention as applied to a cookinglstove having a plurality lof burners which are arranged to bev ignited froma common pilot light. As shown, the stove frame comprises side plates; the rear enclosing plate being designated by the numeral I2, the side plate I3, and the front plate I4. A cooking top I5 is provided having spaced openings I6 beneath which are 6 mounted the cooking top burners I3. An oven 20 is positioned adjacent the cooking top I5 andis heated from a burner 2| vpositioned therein.

The various burners are supplied with fuel from a pipe 23 which is attached to a suitable source of 10 supply andis connected to a manifold 24 extending across the front of the stove to which the control valves 25 for the burners are attached. Each burner is provided with a valve 25 having a. control handle 26 readily accessible to the operator, and each burner is provided with a fuel passage 28 which extends between the burner and its respective valve; a suitable mixing chamber 29 being provided in each passage. y

A pilot light 3l) is provided for ignition of the 20- burners and is shown mounted at substantially the midpoint between the cooking top burners I8. The pilot 3|! comprises a burner 32 with which is associated a valve 33 for control of the supply of gas to the pilot which is fed thereto through a 25 communicating pipe 34 connected to the supply conduit 23 through a shut-oil valve 35.

The pilot light burns constantly, and means are provided so that whenever a burner valve is turned on the gas escaping from that burner 30 I will .be automatically ignited from the pilot. As shown, the pilot 30 is provided with an igniting v conduit 3l comprising a housing 38 which encloses the pilot flame, and spaced branches 39 of tubular section extendingfrom the housing 33 toward 35 each of the burners. Each burner is provided with one or more jetfopenings i0 which are directed l toward the end of the adjacent conduit branch 39 so that upon opening a fuel valve 25 the gas escaping from the. jets an win travel through 4o v ply pipe 23 and has a movable valve member which 5 0 regulates the passage of fuel through the pipe. 'I'he valve member is operatively connected to a heat responsive device 43 positioned within heating range of the pilot so that -fa change in temperature at the pilot will cause this heat respon- 5 5 contained within the housing 42. As shown particularly in Fig. l, the heat responsive deviceis in the form oi' a bimetallic strip 44 comprising metals of diil'ering expansion value joined so that upon temperature change the strip is caused tobend. 'I'he bimetallic strip 44 is provided with an extended end 4l for attachment to a supporting member 46 as by means of the screws 41.' The supporting member 48 may be formed, as shown, as an arm extending from the valve housing 42 and has provided on it an upstanding lug 48 for' the support of a movable rod 48 extending from the valve housing 42 to the free end 44 of the r element 44. 'I'he valve housing 42 has an inlet end Stand a similarly threaded outlet end 84 for*l attachment to the supply pipe 28. The housing is provided with a dividing partition v4l having an opening 58 through which the passage of fuel is controlled by a-valve member l1 attached tojthe control rod 49. The valve member I1 is con-- stantly urged toward closedposition by provision f. of a spring 58 and is moved toward open positionr by a 'movement of the bimetallic elemente re- 11 sulting from an increase in the temperature og.-

the element.

The bimetallic element 44 is positioned adjacent the pilot flame and, due tothe unequal expansion lcharacteristics of the metals of which it is made, it is caused to flex as the pilot tem-5 perature varies.

49 extends within the housing 42 for attachment to the valve member 51 is closed by provision of a flexible diaphragm 82 which may be made of leather or other'suitable material, anclv is shown securely fastened at 82 to the rod 49 and at 84 to the housing 42. As this diaphragm is subjected only to the fuel pressure in the burner supply there is but a slight load upon the exible member.

To provide a visual indication of the operation of the pilot ilame a movable indicating target '48 is provided within view of the stove operator, and is operatively connected to the `element 44 so that the target will be moved as the element 44 moves. As shown, the target 88 comprises a plate like member 69 pierced for pivotal support at 10, and a perpendicularly extending flange portion 1I presenting a curved face circumferentially related to the pivot point 18. A supporting bracket 13 is attached to the housing portion I4 of the stove by means of the screws 14, and is provided with an attaching stud 15 for pivotal support of the target 68. The bracket 13 is arranged to support the target with the flange portion 1i parallel to the stove front and in operating relationship with an opening 18 provided therein. 'I'he ilange portion 1i of the target has on" and oit indications provided thereon so that the operation of the pilot light can be determined by observing the indication appearing in the window 16.

A connecting link 18 extends from the rod 49 to the target for movement thereof asthe element 44 is moved. As shown. the link 18 is attached to the rod 49 by a fitting 19, and is pivotally con- 'Ihe element is constructed move in a direction to open the val've,l1 whenfit becomes heated and, so long as the pilot is burning, the valve is maintained open so that fuel may ,filow freely through the control valve housing 42-f to the burners. If the pilot should become extinguished the element 44 moves in a reverse direcj u tion so that the valve 51, under urge of the spring y' l1' which controls the passage of. fuel through the lopening 58' in the dividing partition 55 of the 1 the indication oil and on" to appear within the 5 window 14 as the element 44 moves due to temperature change. An embossed portion 83 is provided on the stove member I4 of such radius as to permit the target to be mounted closely adjacent the window 18, and to permit the window 19 l0 to be positioned so that it is easily visible to the operatorof the stove. The words Pilot light may be provided on the stove member i 4 adjacent the opening 16, as shown at 84, as an aid to indi- Y eating theoperation of the pilot. l5

Referring particularly to Fig. 4, an arrangement l "of parts is shown wherein the control valve 42 the indicating target4 98' are independently actuated; lIn this illustration of the invention ex'pansible fluid controls are substituted for the mechanical linkage of Fig. l. A control assembly comprises a tubular cell 88 which is positioned adjacent the pilot flame, and has attached to it 'aff'communicating tube 99 which connects to a bel- :i lows 90. 'I'he .bellows 98 is caused to move by the 25' expansion or contraction of the fluid contained y'therein upon subjecting the cell 88 to temperature change. As shown, the* igniting conduit 91' of the pilot 22' is arranged to support two cells 88 so t these members stand within the confines of 3") the housing 98 and within heating range of the lpilot light 22.

` ,The expansible fluid control assembly which acltuates the fuel supply valve 42' is arranged so that bellows is suitably supported, as indicated 35I j' at '92, from the housing 42'. A rod 93 connects the freel end of the bellows with the valve member valve. Expanding movement in the bellows 98 is 40 resisted by a spring 5,8 which tends to move the l valve memberl1 to closed position. Tension of with an extending wing 91 for pivotal support at I8 of the target 89'. A connecting rod i t0 extends from the free end of the target bellows 90 to a pivotal attachment at i0i with the target 88 so that as the target bellows 89 moves upon tem- 55 perature change, the target will be caused to swing through an arc suillcient to change the indications |83 which show alternately through the window 18 of the stove member i4.

Both the control valve and its associated actu-y 00 ating mechanism, and the indicating target and its actuating mechanism are complete'self-contained units which may be removed bodily from' the stove structure. The cells 88 are attached to the igniting conduit as by provision oi' set 65 screws |05 which are threadedhin the conduit housing and serve to clamp the cells where they pass through the housing wall. Upon removing the cells from the housing by loosening the set screws, the indicator assembly may be entirely 70 removed by merely detaching the bracket 98, while the control comprising the valve housing 42 may be readily detached by merely unscrewing the valve from its position on the fuel supply conduit 23'. 75

If d'esired, the valve actuating mechanism and indicator actuating mechanism may be interconnected for operation from a single tubular cell 88 as indicated in Fig. 11. With such an rangement the communicating tubes 89' for the valve and indicating mechanisms are joined so that pressure change in the system, as a result of temperature change at th burner, is uniformly distributed to the two attached mechanisms to cause simultaneous operation of the valve control and of the indicator. I

The valve structure shown in Fig. 8 illustrates an expansible iiuid control which serves to actuate an indicating device as well as provide for regulation of the passage of fuel through the valve. The valve housing 42 is provided with a dividing partition 55" having an opening 56" which is controlled by a valve member 51" interconnected by a link 93' with the free end of a bellows 90. The bellows 90 is carried by a shell 92 which serves as an enclosing housing for the opening in the valve through which the connecting member 93 projects. The fixed end of the bellows 90' has a tube connection 89' which extends to a heat responsive element such as the cell 80 shown. The connecting member 93 which serves to actuate the valve member 51 continues beyond the valve member, as shown at |05, and passes from the valve housing 42" through an opening defined by the flange |01.

The rod extension |05 is adapted to be connectedto an indicating target such as that shown in Fig. 9, so that the operator may readily determine the position of the supply valve and the condition of the pilot light. A exible closure is provided for the opening through which the rod extension |05 passes and is shown in the form of a flexible diaphragm 62' which is held to the rod |05 by the clamping washers 63', and isv tion, it is to be understood that the invention isA not limited to these precise forms of apparatus, and that changes may be made therein without departing from the scope of the invention which is dened in the appended claims.

of the iiuid container. l0

2. In a stove having a burner and a fuel supply therefor, means operable to indicate whether the burner is ignited or extinguished, said indicating means comprising a flexible container, a

movable target, means pivotally supporting said target and supporting said fiexible container, means interconnecting said target and the said container, and a uid containing cell positioned in heating relation to said burner and in communication with said exible container to produce movement of said target upon a change in temperature of the cell.

3. In a stove having a burner and a fuel supply pipe therefor, a pilot light operable to ignite the burner, a valve positioned in said fuel supply pipe to control the passage of fuel to the burner, an expansible fluid container having a portion positioned adjacent said pilot light and an interconnected expansible portion operatively attached to said valve and operable to move the valve upon a change in temperature of the expansible iiuid container, a movable indicator operable to indicate whether the pilot is ignited or extinguished, and a second interconnected expansible portion of the expansible fluid container operatively connected to said movable indicator and operablel to move the indicator to visually indicate the temperature condition at the pilot light.

4. In a stove having a burner and a fuel sup- 40 ply pipe therefor, a pilot light operable to ignite the burner, valve means connected to said fuel supply pipe to regulate the passage of fuel therethrough, a movable indicator operable to indicate whether the pilot is ignited or extinguished, and

control means for said valve means and indicator, said control means comprising a containing means for an expansible fiuid which fluid is responsive to the heat of the pilot light, portions of said last-named means being operatively con- BERTRAND B. KAHN. 

